| Krystal Fashions T/A Handbags R US Ltd | Wholesale & retail | 2023 |
| Krzysztof Kotecki Transport Ltd. | Transport & logistics | 2014 |
| KS Hybrid Car Hire Limited | Administrative & support | 2024 |
| Ks@Kt Limited | Wholesale & retail | 2013 |
| KSA Properties Limited | Households | 2020 |
| Ksdavies Ltd | Hospitality | 2025 |
| KSHAH313 Ltd | Professional & scientific | 2022 |
| Kskn Ltd | Hospitality | 2024 |
| KSM Capital Limited | Real estate | 2016 |
| KSM Events Ltd | Hospitality | 2024 |
| Ksmce Limited | Real estate | 2020 |
| KSP Properties (NW) Limited | Real estate | 2025 |
| KSS NW Limited | Administrative & support | 2014 |
| Ksvl Transport Limited | Transport & logistics | 2021 |
| Kswmk Ltd | Other services | 2026 |
| KT1 Commercial Limited | Administrative & support | 2025 |
| KT1 Domestic Limited | Administrative & support | 2025 |
| KT7 Property Limited | Real estate | 2025 |
| Ktag Products Limited | Wholesale & retail | 2015 |
| KTB Property Maintenance Ltd | Construction | 2024 |
| KTC IP Holding Ltd | Financial services | 2026 |
| KTC Studios Ltd | Information & communication | 2026 |
| Ktjpa Hospitality Ltd | Hospitality | 2023 |
| KTL Holdings Limited | Financial services | 2017 |
| KTM Homes Ltd | Construction | 2022 |
| KTM Nexus Ltd | Information & communication | 2022 |
| KTM Produce Ltd | Wholesale & retail | 2017 |
| Ktpharm Ltd | Administrative & support | 2022 |
| Kubus (Bolton) Ltd | Wholesale & retail | 2024 |
| Kucher Consulting Limited | Wholesale & retail | 2011 |
| Kudio Ltd | Information & communication | 2025 |
| Kudu Engineering Ltd | Professional & scientific | 2020 |
| Kuikidi Ltd | Wholesale & retail | 2015 |
| Kulasi Ltd | Real estate | 2019 |
| Kumfortzone Limited | Health & social care | 2008 |
| Kumos Consulting Ltd | Information & communication | 2018 |
| KUN FA YA KUN Corporation (UK) Ltd | Professional & scientific | 2026 |
| Kundox Medical Ltd | Real estate | 2020 |
| Kundox Properties Ltd | Real estate | 2022 |
| Kunyoung Ltd. | Professional & scientific | 2015 |
| Kurdish Nutrition Ltd | Other services | 2025 |
| Kurdish World's Tandoori Naan Ltd | Hospitality | 2020 |
| Kurdo Mini Market Ltd | Wholesale & retail | 2026 |
| Kurien Ltd | Real estate | 2019 |
| Kurumono Limited | Administrative & support | 2012 |
| KVA Power Installations Ltd | Manufacturing | 2016 |
| KW Tiling Specialists Ltd | Construction | 2025 |
| KW Writing Limited | Information & communication | 2023 |
| KWB Consultancy Ltd | Professional & scientific | 2025 |
| Kwick Parcels Ltd | Wholesale & retail | 2025 |
| Kwik Foods Ltd | Wholesale & retail | 2019 |
| Kwiq Finds Stays Ltd | Real estate | 2023 |
| Kyalami Innovation Limited | Professional & scientific | 2020 |
| Kycole Build Limited | Construction | 2015 |
| KYE Waters Electrical Services Limited | Construction | 2015 |
| KYK Medical Ltd | Health & social care | 2017 |
| Kylon Properties Limited | Households | 2021 |
| Kyrangel Ltd | Information & communication | 2019 |
| Kyrascope Limited | Information & communication | 2010 |
| KZ Legal Consultancy Limited | Professional & scientific | 2024 |
| KZ Properties Limited | Real estate | 2017 |
| KZR Pharma Ltd | Professional & scientific | 2025 |
| L & M Transmissions Limited | Wholesale & retail | 2021 |
| L & S Futures Limited | Financial services | 2025 |
| L a Boxer Limited | Arts & recreation | 2021 |
| L and L Hill Properties Limited | Real estate | 2023 |
| L B African Restaurant Limited | Hospitality | 2018 |
| L C D Parts 786 Ltd | Wholesale & retail | 2016 |
| L D Properties & Lettings Ltd | Real estate | 2025 |
| L Derbyshire Holdings Ltd | Information & communication | 2024 |
| L Fanning Ltd | Information & communication | 2021 |
| L H Elec Systems Limited | Construction | 2024 |
| L Italy Limited | Hospitality | 2025 |
| L J C Electrical Services Ltd | Administrative & support | 2005 |
| L J FBA Ltd | Wholesale & retail | 2024 |
| L J Murphy Ltd | Administrative & support | 2023 |
| L LEE Urology Ltd | Health & social care | 2022 |
| L M Prospect Ventures Ltd | Real estate | 2024 |
| L M Wholesale Ltd | Wholesale & retail | 2023 |
| L Peacock TM Ltd | Transport & logistics | 2024 |
| L R Holdings (NW) Limited | Financial services | 2023 |
| L R Properties (NW) Limited | Construction | 2022 |
| L S Welding Services Ltd | Construction | 2007 |
| L Shorrock Plumbing & Heating Ltd | Construction | 2017 |
| L Timperley Brickwork and Construction Ltd | Construction | 2025 |
| L V Medical Limited | Health & social care | 2007 |
| L Valli Consultancy Ltd | Professional & scientific | 2023 |
| L W Turton Limited | Construction | 2019 |
| L&B Motors Ltd | Wholesale & retail | 2020 |
| L&Lweddingcars Ltd | Transport & logistics | 2022 |
| L&M Dental LAB Ltd | Health & social care | 2019 |
| L&S Living Ltd | Construction | 2026 |
| L&S Property Group Ltd | Real estate | 2025 |
| L. a. Interpreting Service Limited | Professional & scientific | 2017 |
| L. Livesey & Sons (Bolton) Limited | Extraterritorial | 1960 |
| L. Pearse Joinery Limited | Construction | 2003 |
| L. Smith and Sons Engineering Contractors Ltd | Construction | 2026 |
| L.Constant Hot Water Ltd | Construction | 2025 |
| L.G.D.S. Associates Limited | Other services | 2019 |
| L.G.S. (Bolton) Limited | Hospitality | 2018 |